Question

choose one pair of vertical angles from the diagram below: *

Explanation:

Vertical angles are formed when two lines intersect. They are opposite each other and are equal in measure. In the given diagram, we look for two angles that are opposite each other at the intersection of the lines.

Answer:

One pair of vertical angles is $\angle1$ and $\angle5$. Another could be $\angle3$ and $\angle8$, $\angle2$ and $\angle4$, $\angle6$ and $\angle7$ (any one of these pairs is a correct answer).